import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)

N = int(input())
KLD = tuple(tuple(map(int, input().split())) for _ in range(N))


def F(x):
    cnt = 0
    for k, l, d in KLD:
        if x < l:
            continue
        i = 1 + (x-l)//pow(2, d)
        cnt += min(i, k)
    return cnt % 2


l = -1
r = 10**18
while r-l > 1:
    m = (r+l)//2
    if F(m):
        r = m
    else:
        l = m
print(r)